For Extreme Humidity | Fill Single Fabric Holder | Individually Overwrapped

Boveda High-Absorbency 49% RH Single Size 40


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If you live in a high humidity locale year round, here's the solution to keep guitars and other wood instruments in the moisture safe zone. Tested in a lab at rainforest-like conditions! Absorbs 3x more moisture than Boveda 49% RH.

Using Boveda High-Absorbency in an instrument case: 

  • Protects wood instruments from warping in year-round extreme humidity level of 50+% (Lower humidity? Shop Boveda 49% RH for wood instruments here.)
  • Staves off mildew build-up
  • Maintains an ideal relative humidity range for instruments—45-50% RH
  • Prevents humidity fluctuation from going in and out of air-conditioned venues, playing outdoors or traveling by air

This single refills:

  • Single Fabric Holder for storing: 

    • Violin
    • Viola
    • Clarinet




  1. First remove the clear overwrap from the Boveda, then slip unwrapped Boveda into the pouch of its protective fabric holder. (Do not open the Boveda itself.)
  2. Follow placement instructions for Single Fabric Holder here

 Always insert Boveda into a pouch of a Boveda fabric holder before placing in an instrument case. The fabric holder allows Boveda to last longer and work better and acts as a liquid barrier if a packet is accidentally punctured. 

Do not mix Boveda 49% RH High-Absorbency and Boveda 49% RH or different Boveda RH levels within the same instrument case. And do not use Boveda in the same case with other humidification products because they will fight against each other and reduce the efficiency of Boveda.

Use one (1) Boveda High-Absorbency 49% RH Size 40 to fill a Single Fabric Holder.

Each Boveda is individually overwrapped. 

Boveda will last 2-6 months depending on the time of year, your climate and your case.
Unopened package: Up to two (2) years 

When Boveda 49% RH High Absorption fully expands, it’s time to replace the pack. Order a replacement pack BEFORE Boveda fully expands to avoid a lapse in humidity protection for an instrument in high humidity.

Achieves and maintains a constant relative humidity (RH) range between 45% and 55%.

Food-grade salt, purified water and a food-grade thickening agent sealed inside a leakproof membrane.

Size 40: 5.25"/13.34 cm x 3.5”/8.89 cm

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